Nut and bolt lock



(No Model.) r

T. A. FLANIGAN. NUT AND BOLT LOGK.

No. 482,472 Patented Sept. '13, 1892];

am my.

UNITED STATES PAT NT OFFICE.

THOMAS A. FLANIGAN, OF PITTSBURG, PENNSYLVANIA.

NUT AND BOLT LOCK.

SPECIFICATION forming part of Letters Patent No. 482,472, datedSeptember 13, 1892.

Application filed April 12, 1892. Serial No. 428,892. (No model.)

To all whom it may concern.-

Be itknown that I, THOMAS A. FLANIGAN, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements in Nutand Bolt Locks; and I do hereby declare the following to be a full,clear, and exact description of theinvention,such as will enable othersskilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

My invention relates to an improved means forlockingnuts to theirbolts;and it consists in certain details of construction and combination ofparts, as will be fully described hereinafter.

In the accompanying drawings, Figure 1 is a front elevation of myimproved nut-lock, which is constructed in accordance with my invention.Fig. 2 is a plan view of the same having the cap removed therefrom. Fig.3 is a perspective view of the cap used to prevent the locking-bolt frombecoming loose. Fig. 4 is a side elevation, partly in section, of thelocking-bolt. Fig. 5 is a rearperspective view of a modified form of thelocking-cap, in which small projecting portions are shown, adapted to beplaced over the rear face of the nut to prevent the cap from becomingdetached from the said nut.

To construct a n ut-lockin g device in accordance with my invention, Iprovide a nut 2 and form at suitable points two grooves 3, eachextending from the front to the rear of the said nut. One side of thenut 2 is provided with a circular-threaded opening extending through thesame, and in which is placed a small tap-bolt 5, having a sharpenedpoint 4:, formed by concaving the same. This bolt 5 when screwed tightlyagainst the large bolt 1 to be looked the same will be prevented fromturning. To prevent this small tap-bolt from becoming loose, I provide acap 7, adapted to fit neatly about two sides of the head of the saidbolt, and having bent edges 8, which engage with the grooves 3 formed inthe sides of the bolt 2. This cap is placed in position by moving thesame endwise over the head of the bolt 5, and held in position byacotterpin 6, passed through the cap 7 at the back of the head of thebolt 5; or a cap, such as shown at Fig. 5 on the drawings, may be usedand the end projecting pieces 9 placed or bent over the rear side of thenut 2.

Having thus described my invention, what I claim, and desire to secureby Letters Patcut, is

A nut-locking device, substantially as described, consisting of a nuthaving a threaded orifice through one side of the same, a tap-boltadapted to project through said orifice and lock said nut, a cap adaptedto be bent over the head of the said tap-bolt to prevent the same fromturning, means for holding said cap in position, and means to preventthe cap from slipping off endwise of said nut, all arranged and combinedfor service substantially as and for the purpose described.

In testimony that I claim the foregoing I hereunto affiX my signaturethis 16th day of March, A. D. 1892.

THOMAS A. FLANIGAN.

